Aladdin Digital Infrared Language Distribution
Installation and User Manual
Televic Conference Systems
2011-09-01
17
1.3.4.
The Footprint of the
Radiator
The number of transmitted carriers and the output
power of the radiator determine the coverage area
of a radiator. The total radiation energy of a
radiator is distributed over transmitted carriers. The
coverage area becomes proportionally smaller if
more carriers are used. The receiver requires a
strength of the IR signal of 4 mW/m
2
per carrier to
work well (resulting in an 80 dB S/N ratio for
uninterrupted audio channels.).
The footprint is designed by the cross section of the
3-dimensional radiation with the reception level of
participants (the dark grey area in Figure 1.9 to
Figure 1.11). In this area, the direct signal is strong
enough to ensure proper reception when the
receiver is directed towards the radiator.
The size and position of the footprint depends on
the mounting height and the angle of the radiator.
Figure 1.9: The radiator mounted at 15° to the ceiling
Figure 1.10: The radiator mounted at 30° to the ceiling
Figure 1.11: The radiator mounted perpendicular (at 90°)
to the ceiling
